Pay-station telephone system.



Clt-1. EmcKsoN. PAY. STATION TELEPHONE SYSYEM.

l APPLICATION FILED Nov. 9. 190e. J 1,196,84'?. PatentedSept. 5,1916.` v swims-SHEET 1.

"UNITED STATES PATENT oFFIoE.

CHARLES J. ERICKSON, on CHICAGO, `ILLINOIS, nssIGNon, BY MnsNn ASSIGNMENTS, To AU'n'oMATIcELEcTnIc cd., A conronnrron'or ILLINOIS. f

- PAY-STATIonTELErHoNn s'rsTEiu,

,TQ allfwliom. 'it may concern a citizen'f the United States of America,

and rsident of Chicago, Cook fcountyLIllinoi's, have invented a certain 'new 'and useful "Improvement in Pay-Station Telephone Systems',"of which the following is a. speci' iication'.

f" My inventioncontemplates anfaut'omatic."

telephone' exchange system pay-station apparatus.

#It also contemplates `an improved tele-I y phone pay-station'apparatus :for use in connection with a 'telephone exchange ksystem ofjany suitable ory desired character.

exchange .systemA in' which a calling subscribe'r employs electrically-propelled' and step-by-step-actuated switching machines, such 'as individual switches, automatic selectors andconnectors, for obtaining connec "tion with the calledl subscribers line; vin

which thesubscribersare provided with ro-.

tatable vdials orother impulsetransmitting devicesfor controlling the said switching.

machines in accordance with the 'digits of y any called number; and in which they calling- 'subscriberhcannot converse with the called subscriber, after getting the desired' con nection, except by depositing a coin in the box ofthe pay-station apparatus Again, yand more specifically considered,

,my invention contemplates a subscribers paystation arrangement involving a deviceby which the subscribers telephone circuit 'is opened Whenhe-calls, but not when he answers, together with a coin-controlled verse with' the called; subscribers,y even'l mechanism for.' closing a parallel connection aroundy said break or opening in the `teley phone circuit, whereby the calling subscriber cannot converse with the called sub .scriber until after a coin .has been deposited in the'receptacle 'or moneybox at the calling substation. With such arrangement .it willA `Joe seen" that I provide anfautomatic sysi tem vin which calling subscribers cannot conthough they can hear the called subscribers answer, exceptby depositing coins in the boxes of the pay-station mechanism atthe calling 'substations When'used 1n congunction witha manual `telephoneexchange sy'si temit will be' seen, howeventhatthetcalling 4 l1 y'. i f

subscriber mustplacethe coin inthe boxl before attempting to give the orderfoi" C011-,

nectiom 'as in this case the `operator must` receivethe number ofthe called subscriber` beore'connection can be' extended through to the called 'subscribers line. As stated,

though, in an automatic systemembodying the`I principles of vmy rinvention theC calling' subscriberfdoes' not deposit a. coin inthe box of his pay/station apparatus unless or until after he lhears 4the called subscriber answer. f l

To the foregoingF and other useful ends,

,myinvention' consists in matters hereinafter X 'set forth ,and claimed.

I More lspecifically considered, my inven- -tion contemplates an automatic telephone automatic .telephone system' comprising. the kcalling substation A, central'statlon battery.

B, connector-switch C, yfirst-selector switch l) of the calling line, tiret-selector switch E of the ,calledl line, andthe called substation'hv F. Battery B of .thecentral station has its positiive'terminal preferably grounded at G. The ringer generator for signaling purposes is shown'at' H, and the-busy machine orfde vice is'indicated at I. Fig.' 2 shows in detail the mechanical and operative arrangements of the pay-station mechanism. Fig. 3 shows the upper section of the pay-station device, the aperture through whichthe coins` are passed, and ajshutterfarrangement `for Y maintaining4 the said aperture normally closed. Fig. 4.- is a detail ofthe mechanism employed for maintaining'the shutter nrmally closed.

The pay-station attachment, as shown in thek drawings, is used in connection with a substation of any suitable or a proved type. 1

Substation4 A comprises, in a Vdition tothe above, a4 receiver 2, switch-hook 3, inductioncoil LL, which latter consists ofthe primary Winding and secondary winding 6,transmitter local battery 8 yand-the' ringerA 9. Therel is also animpulse wheel 10y which has the usual vertical impulse teeth l'lfthatjare' adapted to operate the vertical impulse spring; 1,2.` 'The impulse wheel `carries. the

rotary impulse. spring 14; ,The'switclsrfhook has radiating from its'bodyjaf.

iotf l frotary impulse rtooth 13 whch'bperates the y with the substation ground G1,whereby when# the subscriber releases the dial after pulling cam arms 15, 16 and 17, and is pivotally secured to the keyboard (not shown) by the screw 18 about which it moves when the receiver is removed. The movement is produced by a spring (not shown) and the switch-hook is pushed up for the purpose of changing certain circuit connections to be` described.n Thecam arm 15 controls thersocalled locking arm 19 thatnormally rests in the position indicated ,at substation F.'

After theY dial is rotated the locking arm 19 occupies the position shown at substation A, and the mechanical operations by which this is broughtabout are well known. The coy operating groundlsprings 20 and 21 engage, thus placing theground post 22 in contact it down, the vertical impulse teeth 11 will cause the vertical impulse spring 12 to come in'contact with the 'groundlpost 22; and immediately after, the rotary impulse tooth 13 causes the rotary impulse spring 14 to come iu contact with the same ground post 22.

`*When the switch-hookis'down the cam arm subscriber may signal anotherafter a con- V nection has been established comprises a pushbutton 2S and a spring 29,` whichlatter ,normally engages the contact point 30; but

when the push button 28 is pressed the spring 29 leaves the contact point 30 and en gages the contact point 3lk which is connecttid eil with the substation ground G1. The

means whereby the subscriber may-release the central station ayt-paratus brought into service comprises three-i springs 32, 334 and 34 known as the release springs andso con trolled by the cam arm 16 that `when 4the switch-hook descends the three release springs are brought into Contact, thereby grounding both of the subscribers line conductors simultaneously. In addition the )rimar f circuit of the substation is )rovided with the springs 35 and 36 which are normally in contact, but are so controlledbythe locking arm 19 that when the receiver 2 is removed from -the switch-hook 3 and the dial rotated the' locking arm 19 is forced upwardly, thus separating the springs 35 and 36. The said springs do r ot break contact when the receiver is removed from the switch-hook, but only when. the dlalis rm taicifl. I1`urtl'1ermore, the said primary circut is extended to the springs 37and 38 of be of any -the coin-col1ecting attachment,which springs Vare normally disconnected.

Thelirst-.selector switch shown at D may suitable or approved type, forinstance o the general type described in Patent No. 815,321', granted March 13, 1906, to Keith, Erickson and Erickson. It embodies among other `details the following wellknown devices and circuits: A switc i-shaft (not shown) carries the vertical and rotary :wipers 39 and 40, respectively, and the private 'wiper 41. The side switch is well-4 known and comprises the side switch wipers 42, 43, 44 and 45 which may be designated as vertical, rotary. and private side switch wipers, and the rotary magnet side switch wiper, respectively. The side switch is under the control of the private magnet u46. Through the medium of the vertical line relay 47 and whilethe side switch isin first position the subscriber controls the vertical magnet 48, which latter operates to raise the shaft and shaft wipers 39, 40 and 41 vertically. By means of the rotary line relay 4 9 and while the side switch is in first or second position the subscriber controls the private magnet 46 and, therefore, the side switch. While the side switch is in second osition the rotary magnet 50, which carries t e shaft and shaft wipers in a rotary or circular directon, is energized. The vertical and rotary line relays 47 and 49acting conjointly provide means whereby `the subscriber con trols the release magnet 51, while the side switch is in rst or second position.y After the side switch passes to third position, then since the first selector is of the trunk re# .lease type the said switch' is controlled through the next switch with which a con-A nflction has been established, through the private wiper 41, by means of the back-re- Alease r'elay 'The bridge-cut-oii' relay 53- is provided to open the connection between' the line relays 47 and 49 and between said relays and :battery B. This is desirable because ifthe relays are not disconnected from each other and thebattery the ringing current for signaling the, subscriber may then operate either or bothof the relays 47 and 49 and cause some interference with the switch. It is also desirable to remove the bridge formed through the said relays from across the line to give the voice-current as clear a path as possible. The rst-selector switch-- shaft is also 'provided with a normal post arm 54 which, when the shaft is in normal position, closes the spring 55 with the contactpoint 56; buty when the shaft is raised one ormore steps the spring 55 closes in contact with the point 57.

The connector switch C mayalso be of any suitable or approved type, for instance of the type described in Patent No. 815,176, granted March 13, 1906, to Keith, Erickson and Erickson. The mechanical details of thelirstLselector and connector, asl is well*v known, are very much the same, although there is some material diference in thecirlcuits. The connector switch 'shaft (not.

shown) carries, like the first-selectorswitchto givethe shaft and shaft wiperstheir vertical motion, and the rotary-magnet -64 i'mparts to the shaft and shaft wipersi`a' rotary or circular motion. The rotaryline relay i 62 controls the private .magnet 65, which latter under certain conditions in turn controls the vertical and rotary magnets 63 and v64, `release magnet 66' and-'theside switch wipers 67,568, 69 and 70.4r ,The side switch of the' connector, like they side switch'of the 'first-selector, basa normal or first position, ,jasecond position'and a third position. The `--release magnet `66gisalso controlled byl the-y line'rela'ys', 61 and -62 conjointlyy the 1cond'ensers71jand 72 the line circuit through y L :the connector is divided into '-twoj sections. l

The--back-bridg'e relays 74and 75 give to the-called subscribei'i-means whereby he may release the connector switch Iwhich has been connectedwith.his-line. The central office is equipped ,with a busy-signaling? apparatus ofiany suitable design, as, for example, the one comprising an interrupter` 76' in series --with' the primary winding 77 of the induction-coil 7 8, whereby a busy-signaling cur-v connector yswitch-shaft also carries a normal.

`soA

f number of ythe line leading .from the cen--l the contact point 80. f l- The firstselector E l 'same as the first-selectorDpof the Vcalling line rent is induced in the secondary winding 7 9 of the saidcoil. The secondary'winding 79 is connected tothe contact point '80.' The arm 81 which, when the connector shaft is 4' v off normal, allows the. spring 82' vto Aengage of. the called line'is the and,' therefore, the description olfv selector D is applicablef v Y The substation F is, of. course,-a duplicate of substation A and-requires no description; The calling operation by which one subscriber A, for example, may call-.and signal I 'subscriber F is as follows: To call the numf ber 120, which is arbitrarily chosen as* the tral station to the substation F, the subscriber-A 'at substation #110 removes his '3 receiver and operates'his calling device in a suitable manner corresponding to cachv digit. For each digit the fvertical line is-' -y y grounded a certain number of times correspending toV thenumcrical value of thedigit, a ad the rotary line is4 groundedonce.' When thereceiver-2'- is removed fromthe lioolci` magnet.; The cur the ringerl9. is disconnected from-the line when the cam 17 leaves the spring 23, andA at thesame time the secondary circuit is closed across the line by the 'closure of the secondary springs 24 and 25. The primarycircuit is also closed .bythe closure of con-- tact between the springs' 26 and 27 The first digit being lthe subscriber. at sub-y station #110 turns his dial for the first -digit 1, thereby grounding the vertical line con'ductor 82 once, and the rotary line conductor 8 3 once uponthe return motion ofthe dial.

T he ground post 2 2 is placed in connection vwith the substation 'ground known manner by thelactionv of the locking dog 84. Grounding-the vertical line conduc- 47 of the first-selector. The circuitthrough the said relay extendsy from substation ground G1, ground post 22, vertical impulse spring 12, -vertical line conductor- 82 side swltch wiper '42, contact point 85t o the vtor 82 once energizes the vertical line relay relay 47, through the bridgecut0lfy springs 86 and 87 to the battery lead 88, thence through battery B to ground G. Each time that the 'vertical line relay 47 is energiaed vthe Vertical line relay springs-89.` and v9() are pressed into engagement and an energizing circuit is cach time established through'fthe yvertical magnet 48 The circuitthrough the said magnet extends from ground G2 to the springs 90 and 89, lto the private magneto springs 91 ,and 92, 'verticalmagnet 48 vto the battery lead 88, thence through batteryB and to ground G; The vertical magnet beingoperated once the first-selector switchshaft and wipers 39, 40 and 41 -are carried to the level with the contact points that consti` tute the terminals-of the trunk line leadingto the connector C. Following the vertical impulse, the rotary impulse' spr-ing comes in contact with the ground 'post 22, thereby grounding the rotary-lineconductor 83 once and energizing the rotary line yrelay'49 of the first-selector once] The path'bf the energizing current maybe traced as follows: -from the 'substation ground Gl'to the rotary line conductor 83, side switch wiper'43; contact point 93 lto the 'rotary .line relay", 49,

ybridge-cut-of springs94, 86 and '87 v tothe battery lead 8 8, thence throughbattery B and to ground-G. Y The rotary line relay 49 upon energizing closesin contact'thfsprings 95 and. 90, thereby closing l'an energizingcircuit through the private magnet 4 6 which extends from ground Gr2 to thefspr'ings 90 and 95,y private magnet 46 to the battery -lead g88, thence' through battery B and fto L. ground G. The private magnet 46 'being' energized for a moment, the side switch of the first-selector D then passesfrom first-to second position, therebyA permitting the side switch wipcr45 to engage thegcontac't point 9,6, thus closing-a ziik'g'rlritr through the' rotary ffl w is from ground.

G3 to the contact point 96, side switch wiper 45, rotary magnet interrupter springs 97 and 98, through the winding of the rotary magnet 50, thence to the battery lead 88, and

through battery B and to ground G. The

rotary magnet is energized, andV the shaft wipers 39, l0 and 441 are carried into engagement with the bank contacts that constituterthe terminals of the trunk line leading-to the connector switch C, assuming that ythe trunk leading to the said connector leads olf from the first set of contacts of the first level. But if the first trunk line `1s busy, an y energizing circuit is then established Vthrough the private magnet 116 when the private wiper 41 strikes the grounded private bank contact, thereby retaining the side switch in second position and maintaining the energizing circuit through the rotary magnet 50. The rotary magnet, by intermittent energiation, thus A causes the shaft to rotate step-by-step and carry the wipers pastthe last busy trunk line. However, as soonfas the private magnet is deenergi'zed, the side vswitch is tripped into third position; but if there are no .busy contacts to be passed over, as assumed -ln the iirst instance, the rotary magnet 50, as is well known, trips the side switch to the third position, with the result that the side switch wipers 112, 43, 4-1 and 45 engage the contact points 99, 100, 101 and 102, respectively, thus extending the subscribes line conductors 82 and S3 to the connector C. Also,

-since the side switch wiper 44 engages the grounded contact point 101, a guarding potential is established at the'private wiper il for protecting the .seized'trunk line from being molested by any other switch.

The second digit is called after the subscriber has established connection with the connector C by way of the trunk conductors 103 and 101. The subscriber rotates the dial,

`as described, for the second digit 2, thereby lay springs 105 and IOGure pressed into contact, thereby closing an energizing circuit through the vertical magnet 03 over the following path: from ground .G4 to thesprings 10G and 105, private magnet springs 107 and 108, side switch wiper 70, contact point 109, vertical magnet 03 to the battery lead 88,

Vthence through battery B and to ground G.

Each time the Avertical magnet is energized called line.

it operates to raise the shaft and shaft wipers one step at a timeuntil said wipers are carried two steps to a position opposite the level in which are located the terminals of the line #120. When the rotary Iline conductor 83 is grounded the rotary line relay 62 becomes energized over `the following path: from ground Gr1 to the rotary impulse spring 14, rotary lline conductor 83, side switch wiper 43, contact point 100, shaft wiper 110, trunk conductor 10-1, rotary line relay 62 to the battery lead 88, thence through battery B and to ground G. The energization of the said relay causes the energization of the 'private magnet 65 over a circuit extending from ground G", springs 106 and 110, private magnet G5 to the battery lead 88, thence through battery B and to ground G; and the release of the side switch from first to second position thus places the wipers G7, 68, 69 and 70 in connection with their respective contact points in the second position.

i The last digit being O the subscriber operates the dial, as previously described, grounding thevertical line conductor 82 ten timesA and the rotary line conductor S3 once. The vertical and rotary relays 61 and 62 are operated `over previously traced circuits. However, when the line relay springs 105 and 100 engage, a circuit is then closed` through the rotary magnet 641 instead of through the vertical magnet G3. The energizing circuit extends from ground G-4 to the springs 106 and 105, private magnet springs 10T "and 10S, side switch wiper 70,

contact pointl`1.11,'rotary magnet 64 to the' battery lead SS, thence'through battery B and to ground Gr. Each time the rotary magnet is energized it rotates the 'shaft and shaft wipers 5S, 59 and 60 onestep at a time until the said wipers are carried into engagement with the normal conductors 112, 113 and.111 that lead .to the line terminals oi" the desired subscriber. The energization ot the rotary line' relay 02, as previously stated, completes an energizing"4 circuit through the private magnet 65, which now operates with one of two results, namely the release of the side switch from second to third position, or the so-called busy release o'li the connector, which will be described. Suppose the former result occurs and the side switch passes to third position, thus placing the side switch wipers 07, 68, G9 and 70 in contact with the respective Contact points in the third position. Furthermore, when the side switch passes to third position a guarding potential is established for protecting the called line. This potential ertends from ground (is to the Contact point 115, side'switch wiper 69 to the shaft wiper 00, which engages the private contact of the The said guarding potential also closes an cncrgiaing circuit through the bridge-cutoff`r relay 11.6 .ofthe first-selector 1E, thereby removing the bridge formed byv substation ground G1,;the`r'eby energizingthe To siknal subscrl l 4the vertical and ,rotary-line refllay'sofA the first-selector E.. l the called subscriber the calling r presses the signaling button 28, placing thespringA 29'L in vcontact with vthe vertical line relay 61.*` The path of the enL erg'izing circuit yextends from ground Gr?, contact point 31, spring 29,A springs 24 and' 25 to the vertical line conductor 82,- side switch Wiper-A2 contact point 99, iirst-se-v-,

lector shaft-"Wiper 39, trunk conductorl 103,

\ the latter 'th terminalsof'th'e rl i ator H;

vertical relay ,611, to the battery lead, 88', thencethrfi'gh battery B and to ground G. It will be Aremembered''thatfthe' connector side switchv has passed fromrsecond to third f position and that the' side switchwiper 70 is 20 magnet springs 107 `and 108si'de switch Wiper 70, contact point117.`to"the-ringer relay 78 and to the battery lead'f88, thence ringer relay upon energizing shifts the springs 118 and 119, respectively, vfrom the springs 120 and 121 i andJ'onVo-the ersprings 122 and123. This results in v59111312titille,"*thea calling subscriberis line froinftlie called 'sube seribers line and bridging l`adressfthe line 'oi'`A gergenery 'signaling current/is, At he'ref( re, sent from tlye generator H to the ringer" relay springs 122 and 118, side su'ritchI wiper68, contact point 124, connector shaftwiper 59, normal conductorlpf, rotary line conductor 125 to thev ringer 126, spring 127 ,l switch- 'hook 128 to the vertical 'liney conductor 129,

normal. conductor 1.12,#con-nector 'shaft Wiper 58, contact point130, 'sidefswitch Wiper 67,' e ringer relay springs 119 and 123 back'tothe generator H. soon as the 'calling sub? s'criber ceases to press 'the signaling button 28. the ringer-relay 73 becomes -denergized and the springsy 118 'andl 119 resume their g normal positionin Contact with the springs 120and12f1, respectiyely. The subscriber F in response to the signalirernoves the reoei-ver 131 from the switchhoolc 128, thereby Q ,n removing thgfinger 126 from aerosshis line. al?" andbridgingiatead the'y secondarycircuit which inclu'he'sifthe receiver 131'-, secondary il Winding-132,ofthe induction-coil 133, and

6 5' transmitter vcircuit is closed as soon as the secondary srlirin'gs 4134 and 135. The local 847 A- 1 i a springs '13e ane 137 engage in Contact. The* two -substations #110? and l.:t;:120", are now connected with the circuit shown in heavyV lines in Fig. 1. The local transmitter circuit at substation, :li-.120V being complete voice-currents may pass to the subscriber, A,

butV A vin turn, before he can be heard by subscriber l3`, must deposit in his substation n 'l`./:]:110i a com or other suitable object, which closes 4the primary circuit 1 through the springs 37 and 38,. The primary circuit at has `vtaken place, ,is normally open at the springs. 35 and' 36, therebyv` leaving the local transmitter .circuit open until closed at the vsubstation #110,' after a. callingoperation coin-collecting device springs 37 and 38. In the latter case' the pririiary circuit extends from batteryS through the springs 37`and 38 mary Winding 5 of the induction-coil, and

thence through said coil to the transmitter 7 I and to battery 8.

and through' springs 26 and 27' to the prif l The ront release occurs when thecalling I 'subscriber restores the receiver 2 to the switchfhook 3, thereby pressing into en'- Agagement for a momentthe 'release springs 32, 33 and 34. ,The contact'of the said re-k lease springsy grounds the vertical and rol tary line conductors 82 and 83 simultane I ously from ground Gr? to the release springt, 34, thence through the springs' and 32. to?

4the Vertical and rotary line conductors,A

thereby -energizing vthe vertical and' rotary line relays 61 and 62 `of the connector C.

contact, as av result closing acircuit through The springs 138 and 139are'piessed intoloo the-'baclcrelease relay v52 of the first-selector l D inseries with the release magnet l66 of the connector C.: The path of the circuit eX-' f tends'rolm ground G to the'cont'act point V 101, side switch wiper 44, release relay. 52,.`

first-selector switch Wiper 41, connectorrl trunk release springs 138 and 139,V releasey 'magnet '66 .to the battery lead 88, thende through battery `B and to ground G. e When the connect r release magnet 66 is thus supplied with .,u'rre'nt' it energizes, andas a rersult the switch vshaft and side switch are restored to `normal position, thus breaking the connection between the connector switch rshaft Wipers' 58, l59 and 60 and lthev normal conductors 112, i113 and 14. The back-re# l lease relay 52'off the first-selectorl being inA the same, circuit with :the release magnet'r 06f energizes simultaneously' iv-ith the latter "and presses into engagement" the springs v140; and 141, which in turn .close an energizing circuit through the release magnet 51 of the first-selector D.` Thiscircuitiextends from ground Gr7 through'the release relaysprings 140 and-141, through the Winding ofthe release magnet 51 tothe battery lead f 88, thence through battery B and to ground Gn ...All off-the relays and 'magnets thus energized attract their respective armatures,

called subscribers will not remain helplessly tied up, sd to speak, while the bridge-cutoii' relay 11G is energized. Should he desire,

`before the `calling subscriber releases, to

make an independent call he may break the established,connection and secure control oi' the first-selector E. After establishingconnection between the ground springs 112 and 1&3, by operating the dial, he may then ground the line conductors 129 and 125` Simultaneously by restoring the receiver 131 to the switch-hook 128, thus pressing into engagement the release springs 144, 115 and, 146. As a result an energizing current will ass through the vertical back-bridge relay t4 and the rotary baclcbridge Vrelay 75 ot the connector C. The circuit through the .vertical baclrbridge relay extends from the substation ground G8 to the ground springs 142 and 143, to the springs 146 and 145, vertical conductor '129, normal conductor7112, shaft wiper 58, contact point 130, side .switch wiper 67, ,ringer relay springs 11S) and 121, vertical back-bridge relay H to the battery lead 8B. thence through battery li and to ground il. The energizing circuit of the back-bridge` relay 75 extends from ground G8, release springs 146, 145 and 141 to the. rotary line conductor 125,1norn1al conductor 113, shaft wiper 59, contact 'point 124, side switch wiper (i8, ringer relay springs 118 and 120 and rotary back-bridge relay 75 to the battery lead 88. thence through battery B and to ground G. The baclobridge relays 74 and 75, upon energizing simultaneously, press into contact' the back-release springs 147 and' 148, which completes an energizing circuit to the release magnet 66 from ground G to the springs 147 and 148,' through the release' magnet 66, battery lead 8S, thence through battery Brand to ground G. The release" magnet isi thus energized and the switch` shaft wipers 5S, 59 and (50 and side switch are restored to normal position. `The energizingcirc'it through the bridge-cutoff relay 116 isbroken when the shaft wiper'o() leaves the 'private bank contact;,thus the connector switch C is' released and the firstselector E is restored tothe control of substation #120. The subscriber A by grounding the lin'e conductors 82 and'f-83 may restore the frst-selector D. Y

The busy release of the connector C `ol lows as a result of the energization of the rotary line relay 62, if the called line is busy, as follows: The said relay 62 upon energizing energizes the private magnet 65, as pre yfiously described,` which latter in turn `presses the springs 149 and 150 into Contact.

nection with the private wiper 60 (since the side switch wiper-69 is now in second posit1on), wh1chiw1per 60 has previously been rotated onto a grounded Contact. As a result` a flow ofcurrent is sent through the release magnet 66 from the grounded private wiper G0 to the side switch wiper 69, to the private magnet springs 150' and 149 to the release magnet 66, to battery lead 88, thence through battery 'B and to' ground G. The release magnet 66 upon energizing releases the connector `switch shaft and restores the con;

nector side switch to its first position. rel turning the vertical magnet 63 to the control of the vertical relay 61. Therefore, if the calling subscriber (Fig. 1) 4presses the signaling button 28 and grounds the verticalA line `is in service 'and will release the switch` ing apparatus over the same circuits previously described by hanging up his receiver. 4

Ot' course, on hearing the busy-signal the calling subscriber does not deposit a coin as he would it the called subscriber had answered. Busy lines may be either calling or'called and the manner by which protect? ing guarding potentials are established is as follows: The calling line is protected by a guarding potential established by the firstselector at the instant `the switch shaft is moved one or more steps from its normal position, thus permitting spring 5:3 to engage the grounded. Contact point 57. T hc called line is protected by a guarding potential established by theV connector switch when the side switch passes to third position and the shaft wipers come lin contact with the called ,line terminal.

The pay-station attachment for controlling the coinsywhich in tur'n 'control the primary circuit springs 37 and 38 (Fig. 2) comprises a channelJ that terminates at the upper section in the slot 151 (Fig. 3) and at the lower extremityin a slot 152 within the box- K. -I n front of the slot 151 there is a'shutter 153 controlled by the link 154 to whichrlatter it is attached. Normally the said shutter is raised so that no coins may .be dropped through the; outer slot 155 into the inner slot 151 and down the channel J.

The mechanism by which the said shutter is retained normally closed is as follows When the receiver is on the switch-hook 3 the member 156 that carries the-ratchet 157 forr engaging the toothed wheel 158 that engages. the governor.l59,is -raised so that it strikes the lower extremityl159of the link 154. The link is, therefore, driven upwardly, which in turn raises the shutter 153 over the slot 151. When .the receiver is' removed .from the switch-hook themember 156 leaves the link 154,l and the reti-'acting spring 160 then withdrawsthe shutter 153 from in fronty of the slots 151 and 155,-whereby a coin may be inserted; The` member 156 that constitutesv part of thex switch-hook is more clearlylv station apparatus, then render his teleshown in Fig. 4 and swings pivotally about the-support 161. When the switch-hook is downk and the member 156 has operated to raise the link, 154 and the shutter 153, the.

terminal 159 of said link 154 rests upon the member` 156, as shown in Fig. 4. When-a -subscriber has made a lcall and the called subscriber has answered, the `former drops a coin 162 through the slots 155 and 151-and into the channel J, which coin falls against circuit, as already described. -The ,in'su'latf ing member 1.63 is wedge-shaped, as shown, and riveted to the spring 88.

It willbe noticed-that the coin 162) is held between the insulating wedge 163 and r the member 164 and is therefore unabl to susY jpass. Thesaid member 164 is secured o a t flexible spring 165, which spring isl iny turn secured to the portion 1660i the4 .telephone frame. When the switch-hook is up the elbow 167 of the member 156 advances suiciently to engage the in 168, preventing the member 164 from' being driven inwardlyby the coin 162 when it lfalls, since the said pin'168Jis'riveted-.to the said member 164. It will be evident that as long as the sub scribers switch-hook is up his'primary cir'- cuit will be heldv closed by thecoin 162; but as soon as the switch-hook descends andthe elbow 167 leaves the pin 168 the member 164 is thendriven to one side by the Aweight of the coin, which latterA drops-into they box K. l At the Sametime the shutter 153 is raised'and the laperture 151 is closed to ,prevent anyone from droppingV anything into the channel While the switch-hook is down.

v prlma-rycircuit at that e From'the foregoing it will be understood,l ofcourse, that it is necessary that the pri-L marycircuit springs 35 andv36 controlled by .'for connecting calling lines with called lines, and toll vdevices at the subscribers sta springs 37 and 38 then separate, openlng the point` f the locking cam 19 close in'contacty as soon .as the switch-hook descends, sol that the subscriber at the station may be able to talk if another subscriber shouldv ringhim. As-

soon as a calling operation is begunyhowever, the said springsr--and 36 separate,

:phone exchange system provided with' a the toll device herein disclosed `cfmtrolled mechanism. A Y. i? What I claim's my invention 'is:,-+

provided with a device by which he opens his telephone circuitfwhen' he calls, but

`which permits the" telephone circuittoremain closed when he answers.

In vaddition each subscriber is' provided with coin-con trolled `mechanism for closing a parallel l,

connection around the break or opening in the telephone circuit, whereby he may, by then depositing va coin in the box of the payphone equipmentoperative ortalking pur-',. poses after he hears the called subscriber answer.`v Of course, when an automatic sub` scriber thus equipped answersa call he does not disturb his rotatable dial or calling mechanism,v but simply `,takes down his receiver and consequently does -not produce the opening or break in ,his tlephone'circuit, and'does not'at suchgtimecneed to de-A positacoi'n in order to use his telephone. When used- 1n Aa manual systemv my improved pay-'station apparatus would requir `the, depositing of a4 coin in the box befor the callingv subscriber attempts to give` the order for connection, and `would require 'the' provision of some special means for opening'the telephone circuit vwhen the subscriber calls, but not whenV he answers. For thisreason, and -Yas it may have utility-outside ofv automatic systems, I have claimed the different features and combinations of my invention broadly as well as specifically.

Broadly considered, itwill be seen that-` my invention consists of an automatic tele;

measured service device atthe s ubstations foreach subscriber, orfor each. telephone line, ,if only one telephone is used to aline, it being obvious.that any devicewhich 'Will registeror in any way keep track'of the device forlmeasuring the service,y i,

number of calls iswhat may be termed 'a ?,f

nisms. Fol-,the broader purposesv ofmy in' venticnxany sort` of toll .dcvlce may be employed in combination with thes'ubscribers rotary dial oi` callingdevice. Specifica11y l is a coin--- 1. An automatictelephoneA exchange system comprising subscribercontrplled means tions for preventing the use'pf` the' tele-r4 `and called lines, subscribers subscribers rotatable dials or lo a telephone exchange system, the von @lunatica of subscriber-controlled meansl im ronnecting calling lines with called liars, subscribers telephone transmitters,

sul

'lbers calling devices each adapted phone, and subscribers tollWdeiaccsw by i which any callingsubscriber closes the said hreulc or opening in theftelephone circuit ne calling substation.

il. ln a telephone exchange system, the,

crunbination of subscribers lines, trunk lines, exchange apparatus including automatic selectors and connectors for establish` ing trunk line connections between calling telephones, calling de vices for controlling the operations of said exchange apparatus, battery circuits for said telephones-means by which the operation ofany dial or calling device opens the telephone circuit of `the calling substation, and toll devices by which any calling sub scriber closes a parallel connection around the breaker opening produced in the tele phone circuit ofY the calling substation.

5. A telephone exchange syst-em comprising a subscribers tele hone circuit, means adapted to open ,the te ephone circuit when the .r-:ubscriher calls, but notV wheiiLthe subsrrilna answers, means to prevent closing the circuit at such opening during the conti/nw ance of the connection within the exchange, and a toll device by which the subscriber -closes a parallel connection around said break or opening in said telephone circuit.

(i. in a telephone exchange system, the combination of a subscribers telephone circuit,`,a subscribers calling device, a line relay responsive to said calling device, means for opening the telephone circuit when the calling device is used, adapted to `permit the telephone circuit to remain` closed when the subscriber answers a call, means to prevent closing the circuit at such opening during the continuance of the conncction with the exchange,4 and a toll device by which the subscribeucloses a parallel connection extending around the said break or opening in the telephone circuit.

7. A telephone exchange system compris ing a suhscribers telephone circuit, a nor mally closed switch in said circuit, `means for opening said switch when the subscriber calls, a normally openy parallel connection extending around said switch, and a toll device for closing said parallel connection.

8. In a telephone exhange `system, the combination of a subscribers line, an individual switch for said line, a called line, switching machinery for connecting the in dividual switch with the called line, a subscribers rotatable dial or calling device for controlling the operations of said individual switch and switching machinery, a subscribers telephone circuit, means for opening said telephone circuit `when the subscriber operates said dial or calling device, and a toll device by which the subscriber closes a parallel connection extending around the said break or opening in the telephone circuit.

9. In a telephone exchange system, ,the combination of a plurality of substations, means for connecting calling substations Awith called substations, a telephone circuit for each substation, said telephone circuits each comprising an auxiliary circuit used in answering normally in operative condition, each telephone circuit also comprising a second auxiliary circuit used in `calling normally in inoperative condition, dialcontrolled means adapted to render inoperas tive the said answering auxiliary circuit, when a call is made, a circuit-controlling device adapted to be used by the calling subscriber to set up the said calling auxiliary circuit by a toll-assessing operation, and switchhook-controlled means for restoring the calling and answering auxiliary circuits to normal condition.

l0. In a telephone ,pay-station, the combination of a telephone circuit, a dial, a combined toll and circuitcontrolling device, a switch-hook, dial-operated means adapted to render inoperative the telephone circuit when a call is made, said toll deviceadapted to restore .the telephone circuit, and switch--4 hoolecontrolledmeans for restoring the telephone circuit to the control of the dial, and for returning thetoll device to normal cony dition.

1l. In a :telephone exchange system, the combinationtof a plurality of subscribers Y telephones, a telephone circuit for each telephone, lines -for each telephone, meansfor connecting any two lines, cans at each tele phone for mainthining thewtelcphone talking circuit open while the telephone is not in use, means for closing the said circuit when a call is answered, means adapted to render the telephone circuit inoperative when a call is made, means including a toll device adapted to lclose the telephone `circuit at the calling subscribers station for restoring the calling subscribers telephone circuit to operative condition, means for breaking an established telephone connection, and switchhook controlled means for controlling said inoperative.

lio

I massif ,i9

toll device to render'said telephone circuit 12. In a telephone exchange system; the

combination of telephone pay-stations,.cen tral office means for connecting a .calling station with a called statioma telephone cirL cuitforeach station comprising, an answering and a calling auxiliary circuit, Athe former normallyin operative condition and' the latter in inoperative condition, means 4whereby when a calling subscriber makes a call the answering auxiliary circuit is -rendei-ed inoperative,Y a combined toll and circuit-'controlling device for each substation,

each toll device adapted to set up the calling auxiliary circuit, means at the called sub:-

` station whereby when a called subscriber telephone VJfor calling tlieansivering auxiliary.

answers the answering auxiliary circuit atv the called telephone is brought into use, and means at the calling! substation for restoring the calling and answering auxiliary circuits to normal condition.4

13 ..In a telephone exchange system-,'the

combination of subscribers vpay-stations.

means for connecting a .calling subscriber with a called subscriber, a'teleplione circuit for each pay-station, lines for each pay-station, an answering and a calling auxiliary .circuit for each substation telephone circuit, the former noi'mally'in operative condition and tlie latter in inoperative condition, means whereby when a 'subscriber uses his circuit ofhis station is first closed and then opened, a combinedtollkand circuit-control ling device -for' each station, each toll device adapted to close the calling auxiliary circuit, means whereby when a subscriber useshis telephoneto answer a call thel answeringl auxiliary circuit .at his telephone is closed, a switch-hook foreach substation, and means whereby whena switch-hook isdepressed at any substation the auxiliary circuit then closed at the telephone vis opened.

` `14. In a telephone system, in combination, central; oliice connecting apparatus, telephone lines, and pay st ations allotted thereto; each station .comprising a dial, a switch hook, a combined toll and circuit controllingfdegvice, a telephone circuit, an answering and a ailing auiiiliary circuit therefor, said.y circuit normally out 'of use; each switch hook controlling the answering auxiliary circuiti associated therewith whereby the auxiliary. circuit may be connected for use with its line, each dial controlling means for operating the central-oflice apparatus in making a call and for puttingthe answering auxiliary telephone circuit associated there` with. out of use when a call is' made, the toll device of each telephone `controlling the auxiliary circuit of its telephone when operated to brin the latter into use, each switch hook when 'epressed after its associated dial hasbeen operated'to'make a call controlling .the central oliice switches and the calling and answering auxiliary telephone circuits to restore them, andthe telephone switch hook ofthe called subscriber controlling the answering' auxiliary telephone circuits alereby the calling subscribers transmitter is put out of service automatically wlienlie makes a call, means including a toll device for restoring the-'same torse, and vswitchh'ook controlled means for controlling 'said toll device to -render said transmitter inop- Y erative.

16,` kIn ateleplione exchange system, the combination of automatic switches for'con-` Y necting calling subscribers with called subscribers,.subscribers calling devices for con; trollingl said switches, a tollr device at the 'subscribers station individual to eachsubscriber, and a talking circuit controlled by said toll device.

. 17; In a telephone exchange systeimgthe` combination of telephone lines, substati'on's on said lines, automatic means for trim ring calling lines into connection 'with called lines, a toll device at the subscribers station .individual to each substation, anda talking circuit controlled by said toll device. V

1.8.. In a telephone system, the combina- .tion of lines arranged in groups, a connectoi' having vmotion vfrom group to'group to find the desired group, and motion from line to line to thenfind thecalledline in the predetermined group, a measured serv'- ice circuit connection associated with. and allotted .to` one of said lines. and mechanism for controlling said circuit connection whereby toll may beassessed for any suc- Vcessful call from the measuredservice sub-` station through said connection to another line.

19. In a telephone system, the combination of trunks arrangedin groups, a selector having one motionffrom group to group. to find desired group, and another motion from trunk to trunk to automatically select an idle trunky in the predetermined group, telephone lines, 'a measured service circuit connection asso- `f'ciated with one of 'said telephone lines, andmechanism for controlling said circuit connection-whereby toll may be assessed for any successful call from the measured service substation through said selector to another.

telephone line.

20. In a telephone'systein, means including an automatic switch for establishing a talking connection from a calling line to a called lineLmeclianism allotted to the calliis ing line and associated therewith fory assess`r ing,r toll for successful calls from ameasurecl service substation through said switch to another line, means controlled by Said toll mechanism for controlling said talking circuitand means whereby the4 calling sub? scriber can lieve the called subscrber'anwer betere toll is assessed,

2l. A telephone exchange system comprising a subscribers telephone circuit, means.

adapted to break the telephone circuit when the subscriber calls, but not when ai subscriber answers, a toll device by which the subscriber closes a parallel connection around said breuk in said telephone circuit,

'and switch hoolc controlled means for breaking said parallel connection.

In a telephone system, the combinawhich the subscriber closes a parallel c0121-,

nection extending around the said break or opening in the telephone circuit, and switch hook controlled means for breakingaid parallel connection.

Signed by me at Chicago, Cook county,

Illinois, this 1st dayof November, 1906.

CHARLES J. ERICKSON. Witnesses:

EDWARD D. FALEB, BERNARD D WILLIS. 

